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Series 1950G Explosion-proof Differential Pressure Switch
Explosion-proof, Weatherproof, Compatible with Natural Gases
Series 1950G Explosion-Proof Differential Pressure Switch combines the best
features of the popular Dwyer® Series 1950 Pressure Switch with the benefit of natural
gas compatibility. Units are rain-tight for outdoor installations, and are UL listed for use
in Class I, Groups A, B, C, & D; Class II, Groups E, F, & G and Class III atmospheres,
Directive 2014/34/EU (ATEX) Compliant for 2813 II 2G Ex db IIB+H2 T6, CSA
& FM approved for Class I, Div. 1, Groups B, C, D; Class II, Div. 1, Groups E, F, G and
Class III atmospheres. IECEx Ex db IIB+H2 T6 (-40°C<Ta<+60°C). The 1950G is very
compact, about half the weight and bulk of equivalent conventional explosion-proof
switches.
Easy access to the SPDT relay and power supply terminals is provided by removing
the top plate of the aluminum housing. A supply voltage of 24 VDC, 120 or 240 VAC
is required. A captive screw allows the cover to swing aside while remaining attached
to the unit. Adjustment to the set point of the switch can be made without disassembly
of the housing.
Product Applications
- Natural gas applications
- Process applications
- All-weather applications
Models & Ordering
Specifications
- Service:
- Air and compatible combustible gases.
- Wetted Materials:
- Consult factory.
- Temperature Limits:
- 0 to 140°F (-17 to 60°C). Note: Set point drift may occur with ambient temperature changes.
- Pressure Limits:
- 45" w.c. (11.2 kPa) continuous; 10 psig (68.95 kPa) surge.
- Enclosure Rating:
- NEMA 3 (IP54), NEMA 7 and 9.
- Switch Type:
- 1 Form C relay (SPDT).
- Electrical Rating:
- 10 A, 120/240 VAC, 28 VDC. Resistive 50 mA, 125 VDC.
- Power Requirements:
- 24 VDC ±10%. 120 or 240 VAC ±10% optional.
- Electrical Connections:
- Internal terminal block.
- Process Connections:
- 1/8" female NPT.
- Mounting Orientation:
- Diaphragm in vertical position. Consult factory for other position orientations.
- Set Point Adjustment:
- Screw type on top of housing.
- Weight:
- 2 lbs 15.7 oz (1.35 kg).
- Agency Approvals:
- ATEX, CE, CSA, FM, IECEx, UL.
Features
- Compatible with natural gas
- External set point screw provides easy access that simplifies making adjustments without opening or disassembling enclosure
- Easily accessible electrical connection simplifies the installation
Videos
Model Chart
| EXAMPLE | 1950G | 00 | B | 120 | AT | Series 1950G-00-B-120-AT Explosion-proof Differential Pressure Switch, range 0.07-0.15" w.c., Buna-N diaphragm, 120 VAC supply voltage, with aluminum tag. |
| SERIES | 1950G | Explosion-proof Differential Pressure Switch | ||||
| RANGE | 00 0 1 5 10 20 |
0.07-0.15" w.c. 0.15-0.5" w.c. 0.4-1.6" w.c. 1.4-5.5" w.c. 3.0-11.0" w.c. 4.0-20.0" w.c. |
||||
| DIAPHRAGM | B | Buna-N | ||||
| INPUT VOLTAGE SUPPLY | 120 240 24 |
120 VAC 240 VAC 24 VDC |
||||
| OPTIONS | AT NA PRESET ST |
Aluminum Tag Non-ATEX Approved Preset Stainless Steel Tag |
Product Literature
Manuals
Catalog Pages
Product Data Sheet
Approvals
Drawings
Questions
- Question
- Does Dwyer offer a fully UL/FM/CSA approved explosion proof pressure switch?
- Answer
- Yes. The 1950 and 1950G Series.
- Question
- What is the power consumption of a 24 VDC 1950G Pressure Switch?
- Answer
- The Current Draw for the 1950G 120mA @ 24VDC 30mA @ 120 VAC 15mA @ 240 VAC
- Question
- 1950G Dwyer website shows both 0 degrees f temp limit and in other info shows it as -40C. What do we need to order to get -40C?
- Answer
- The temperature limits on the 1950G are; 0 to 140°F (-17 to 60°C). Unfortunately, there is no way to change this.
- Question
- Is the 1950G differential pressure switch safe/suitable for an ethanol and alcohol vapor environment?
- Answer
- Yes, as it is approved by FM for C1D1 Group C
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